20" tire size

[Ackattack]

I think I know the answer to this, but want to run it by some people.

I'll be ordering my wheels here real shortly (probably tomorrow). I'm going to be running 20x10" with 6" backspacing and 315/35/20 in the back(tubbed rear wheel wells). I did all the measurements, and they should fit.

Here is the question. What size in the front, on 20x8 wheels (4" backspacking). I'm thinking 245/45/20. Does this sound right, and should I have any fitment issues?

The truck is bagged on stock arms, but I'll won't be driving it around all aired out.